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Old 01-07-2023, 09:08 AM   #1
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2015 Thor Palazzo Allison Transmission issues

Hello everyone. I have a 2015 Thor Palazzo 36.1 with the Cummins diesel and Allison transmission. I am getting a check transmission message on the dash and the coach will not turn over. I turn the key and get nothing. I can start the coach by jumping the starter but that's the only way. When i jump it, it drives and shifts fine. Any suggestions?

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Old 01-07-2023, 02:54 PM   #2
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You should be able to recover fault codes for the transmission using the shifting pad. Find a manual on your system and it will explain on to do that.
Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
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Old 01-08-2023, 04:10 PM   #3
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Thanks for your reply. I've tried all the steps to display the fault codes through the push button shifter but it only displays N for neutral. I have a diagnostic meter and found a couple codes, which all lead back to a communication issue such as a loose harness etc. I pulled the tcm and the harness is tight (housing is screwed in) and checked a few other connections on the transmission but nothing obvious. I pulled the shifter and the connections seem to be fine and i had full use of the shifter after I jumped the coach and drove it. At this point, I guess its to a mechanic.
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allison, palazzo, thor, transmission

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